Googler cfa13e9616 Update Boxes to support writing negative timestamps to edit list
Previously when there were negative timestamps, the tkhd duration was incorrectly equal to the full track duration rather than the presentation duration of the edit list. From the [docs](https://developer.apple.com/documentation/quicktime-file-format/track_header_atom/duration) - "The value of this field is equal to the sum of the durations of all of the track’s edits".

PiperOrigin-RevId: 752655137
2025-04-29 02:59:28 -07:00
..
2021-10-27 09:12:46 +01:00

Test data module

Provides sample data for media unit and instrumentation tests.